I live in Bridgeport and ride MNR to work, and there's nothing connected (in terms of sidings) to the main line in the Bridgeport area any more. Blame the exodus of heavy industry from the area and the freight-railroading unfriendly nature of the line being owned by the MNR, which is focused on moving passenger trains in large numbers.
If anything were to move on the New Haven line these days, it would have to be intermodal, and there's just no good connections for freight since NYC bifurcates the railroads east and west of the Hudson. Amtrak and/or state commuter railroads' ownership of the northest corridor lines (ex PRR NYC-Washington DC, ex NH NYC - Boston, MA) has made freight into something of an outcast, and trains aren't particularly truck competitive in short haul markets like these. The only viable option would be Roadrailers (no doublestack clearances under wires, and piggyback (trailers) only conventional intermodal just isn't practical in these days of just-about-every-intermodal-train-has-at-least-SOME-doublestack-equipment-in-it.
Hudson River tunnels (ex PRR) never had clearance for much freight equipment, certainly not intermodal (though again, Roadrailers would fit), and are capacity strained anyway. By the time trains sat and waited for the wee hours when the commuter trains didn't need all the capacity available, the trucks could be to their destinations - even with Route 95 gridlock, since the distances are short. Until some infrastructure improvements are made, i.e., multiple tunnels/tracks connecting west of Hudson with east of Hudson rail lines, which is unlikely to happen given lack of government interest in investing in the type of transport they SHOULD be interested in investing in, i.e. rail, and the lack of interest in commuter and passenger railroads to allow freight trains to run without restrictions that render them unable to compete for traffic, we'll continue to see New England freight that's not going all the way to Boston or that's coming from the southeast as opposed to the west moving by truck up 95. Sad but that's what we're stuck with. There are SOME customers (one lumberyard I see freight cars in on my train ride) that CSX switches on the New Haven line, but they aren't exactly doing a booming business along the old NH.
GE, not EMD, makes the best locomotives now; has for over 30 years. Get over it.